(19)
(11) EP 1 463 371 B1

(12) EUROPEAN PATENT SPECIFICATION

(45) Mention of the grant of the patent:
04.02.2009 Bulletin 2009/06

(21) Application number: 04006606.0

(22) Date of filing: 18.03.2004
(51) International Patent Classification (IPC): 
H04Q 11/00(2006.01)
H04L 12/413(2006.01)

(54)

Method for implementing logical MAC in ethernet passive optical network system

Verfahren zur Implementierung von logischem MAC in einem passiven, optischen Ethernetsystem

Procédé pour la mise en oeuvre de MAC logique dans un réseau optique passif utilisant ethernet


(84) Designated Contracting States:
DE FR GB

(30) Priority: 19.03.2003 KR 2003017072

(43) Date of publication of application:
29.09.2004 Bulletin 2004/40

(73) Proprietor: SAMSUNG ELECTRONICS CO., LTD.
Suwon-city, Gyeonggi-do (KR)

(72) Inventors:
  • Kim, Jin-Hee, Samsung Electronics Co., Ltd.
    Suwon-si, Gyeonggi-do (KR)
  • Joung, Do-Young, Samsung Electronics Co., Ltd.
    Suwon-si, Gyeonggi-do (KR)
  • Sung, Whan-Jin, Samsung Electronics Co., Ltd.
    Suwon-si, Gyeonggi-do (KR)
  • Jang, Soon-Ho, Samsung Electronics Co., Ltd.
    Suwon-si, Gyeonggi-do (KR)
  • Lee, Min-Hyo, Samsung Electronics Co., Ltd.
    Suwon-si, Gyeonggi-do (KR)
  • Won, Shin-Hee, Samsung Electronics Co., Ltd.
    Suwon-si, Gyeonggi-do (KR)
  • Park, Tae-Sung, Samsung Electronics Co., Ltd.
    Suwon-si, Gyeonggi-do (KR)
  • Kim, Young-Seok, Samsung Electronics Co., Ltd.
    Suwon-si, Gyeonggi-do (KR)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Leopoldstrasse 4
80802 München
80802 München (DE)


(56) References cited: : 
   
  • SALA DOLORS: "EPON Layering" IEEE 802.3AH ETHERNET IN THE FIRST MILE TASK FORCE, IEEE 802.3AH P2MP STF, [Online] 7 July 2002 (2002-07-07), pages 1-18, XP002366822 Retrieved from the Internet: URL:http://www.ieee802.org/3/efm/public/ju l02/p2mp/sala_general_1_0702.pdf> [retrieved on 2006-02-09]
  • WHAN YOO TAE: "Suggestion for the Layering Architecture" IEEE 802.3AH ETHERNET IN THE FIRST MILE TASK FORCE, IEEE 802.3AH P2MP STF, [Online] July 2002 (2002-07), pages 1-18, XP002366823 Retrieved from the Internet: URL:http://www.ieee802.org/3/efm/public/ju l02/p2mp/yoo_p2mp_1_0702.pdf> [retrieved on 2006-02-09]
  • KIM JIN: "Authentication and Privacy in EPON" IEEE 802.3AH ETHERNET IN THE FIRST MILE TASK FORCE, IEEE 802.3AH P2MP STF, [Online] July 2002 (2002-07), pages 1-16, XP002366824 Retrieved from the Internet: URL:http://www.ieee802.org/3/efm/public/ju l02/p2mp/kim_jin_p2mp_3_0702.pdf> [retrieved on 2006-02-09]
  • GUMMALLA AJAY: "EPON Compliance Architecture" IEEE 802.3AH ETHERNET IN THE FIRST MILE TASK FORCE, [Online] January 2002 (2002-01), pages 1-12, XP002238653 Retrieved from the Internet: URL:http://www.ieee802.org/3/efm/public/ja n02/gummalla_1_0102.pdf> [retrieved on 2006-02-09]
  • YUKIHIRO FUJIMOTO ET AL: "Layering of Point to Point Emulation" IEEE 802.3AH ETHERNET IN THE FIRST MILE TASK FORCE, [Online] November 2001 (2001-11), pages 1-23, XP002243927 Retrieved from the Internet: URL:http://grouper.ieee.org/groups/802/3/e fm/public/nov01/maislos_2_1101.pdf> [retrieved on 2006-02-09]
  • SALA DOLORS ET AL: "MPCP Baseline Proposal Architecture and Layering Model (II)" IEEE 802.3AH ETHERNET IN THE FIRST MILE TASK FORCE, [Online] 13 May 2002 (2002-05-13), pages 1-21, XP002366825 Retrieved from the Internet: URL:http://www.ieee802.org/3/efm/baseline/ sala_3_0502.pdf> [retrieved on 2006-02-09]
  • PESAVENTO G: "ETHERNET PASSIVE OPTICAL NETWORK (EPON) ARCHITECTURE FOR BROADBAND ACCESS" OPTICAL NETWORKS MAGAZINE, SPIE, BELLINGHAM, WA, US, vol. 4, no. 1, January 2003 (2003-01), pages 107-113, XP001162954 ISSN: 1388-6916
  • IEEE: "Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications" IEEE 802.3-2002 SECTION ONE, 8 March 2002 (2002-03-08), pages 1,34-80, XP002366826
   
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


Description


[0001] The present invention relates to a method for implementing MAC (Media Access Control) for an EPON (Ethernet Passive Optical Network) system defined in the IEEE (Institute of Electrical and Electronics Engineers) 802.3ah EFM (Ethernet in the First Mile) standard using general MAC based on an IEEE 802.3 standard.

[0002] A PON (Passive Optical Network) system connects one OLT (Optical Line Termination) to a plurality of ONUs (Optical Network Units) using a 1 x N ODN (Optical Distribution Network) to form a tree-type distribution topology.

[0003] The current IEEE 802.3ah EFM working group defined various functions necessary for an EPON (Ethernet Passive Optical Network) system. The three functions associated with MAC (Media Access Control) include an MPCP (Multi-Point Control Protocol) function, an OAM (Operation, Administration and Maintenance) function and an LLID (Logical Link ID) function. An LLID is positioned within a frame's preamble.

[0004] Referring to Fig. 1, layers based on a currently standardized and defined layering baseline are classified into a physical layer 102, data link layers 104 and an interface layer 106. The physical layer includes a PMA (Physical Medium Attachment) layer 108, a PMD (Physical Medium Dependent) layer 110 and a PCS (Physical Coding Sublayer) 112. Each data link layer 104 includes a MAC layer 114, an MPCP layer 116, a MAC control layer 118 and an OAM layer 120, a MAC client 122 residing above the OAM layer. Here, the higher client 122 can be a router, a switch, a ULSLE (Upper Layer Shared LAN Emulation) processor, etc. The interface layer 106 arranged between the physical layer 102 and the data link layers 104 includes the RS 124 which is an 802 3 MAC-PLS (Physical Layer Signaling) interface layer and a GMII (Gbps Media Independent Interface) layer 126.

[0005] In actual implementation, however, the plurality of MAC layers 114 shown is implemented as a single physical MAC layer Through logical MAC emulation, the MAC functions for the EPON are carried out by the single physical MAC layer 114

[0006] The MPCP and OAM functions each must be implemented in a layer higher than a MAC layer 114. An LLID tagging/detagging function must be implemented by an RS (Reconciliation Sublayer) 124.

[0007] Here, LLID information of a preamble must be available in other higher layers so that the emulation can be performed as if the single physical MAC layer 114 corresponds to the plurality of logical MAC layers. For example, an error counter must be managed on the basis of each LLID, and a packet must be generated and processed according to the LLID.

[0008] In other words, when PON (Passive Optical Network) layers are actually implemented, the single physical MAC layer 114, the MPCP layer 116 and the OAM layer 120 are used, and contents associated with the layers are separated according to the LLID. Accordingly, when an interface function is performed according to a higher MAC client 122 and the LLID, the emulation function can be appropriately performed.

[0009] Fig. 2 shows an exemplary format of an Ethernet frame based on the EFM standard. The frame includes an 8-byte preamble field 21, a 6-byte DA (Destination Address) field 22, a 6-byte SA (Source Address) field 23, a 2-byte L/T (Length/Type) field 24, a data/PAD (Packet Assembly and Disassembly) field 25 indicating frame data, and an FCS (Frame Check Sequence) field 26 which is arranged at the end of the frame and used for checking an error when information divided on a frame-by-frame basis is sent in data communication. The preamble field 21 includes a 3-byte SPD field 211, a 2-byte reserved field 212, a 2-byte LLID field 213 and a 1-byte CRC (Cyclical Redundancy Check) field 214

[0010] Fig 3 shows the conventional architecture for transferring a PON tagging Ethernet frame between layers, as disclosed in an application entitled "ETHERNET PASSIVE OPTICAL NETWORK SYSTEM (SAMSUNG ELECTRONICS CO., LTD.)", filed in the Korean Industrial Property Office and assigned Serial No. 2002-35470.

[0011] In detail, the MAC layer 114 performs a basic operation for a frame transferred from the physical layer 102, and then a DA field 302, an SA field 304, an L/T field 306, a vLink tag field 308 and a data field 310 contained in the frame are transferred up to the MAC control layer 118 which first confirms the L/T field Where a corresponding frame is a user frame, the L/T field 306 indicates a length value of the frame In the case of the user frame, the MAC control layer 118 performs no operation, and transfers the DA field 302, the SA field 304 and the data field 310 to a higher layer

[0012] At this time, the vLink tag field 308 is transferred as the user data field. The multiplexing layer 316 combines MAC addresses within the DA and SA fields 302, 304 and mode 312 and PHY_ID 314 data within the vLink tag field 308, and performs an appropriate reflection or forwarding operation according to a result of the combination. At this time, as the vLink tag field 308 follows the L/T field 306, the multiplexing layer 316 regards the vLink tag field 308 as general user data. The multiplexing layer transfers the vLink tag field 308 to a higher layer.

[0013] Further, a PHY_ID value 314 within the vLink tag field 308 varies with each mode. Where the mode is a P2P (Point-To-Point) mode, a PHY_ID value 314 of the destination is assigned. On the other hand, where the mode is an SCB (Single Copy Broadcasting) mode, a PHY_ID value 314 of an ONU transmitting a frame to a corresponding OLT is assigned. This assignment method is equally applicable to a downstream transmission.

[0014] The LLID information is contained in the preamble 21 of the Ethernet frame according to the current EFM standard shown in Fig. 2 and the preamble containing the LLID information 213 is transferred to a lower layer. In transferring the Ethernet frame to a higher layer, the preamble is removed. Problematically, the LLID information is therefore unavailable to the higher layer, and consequently a single MAC layer cannot be emulated.

[0015] "EPON Layering" represents a slide lecture which was given in July 2002 at the IEEE "Ethernet in the first mile task force" by Sala Dolors. The slides give a broad overview of the topics layering requirements, layering architecture, upstream view and downstream view and also propose a "multiplexing layering". Furthermore, a tagging operation is described in which a baseline attaches a tag to a frame in the preamble, and wherein there are several mechanisms to internally pass tag information across layers within a device:

[0016] "Suggestions for the Layering Architecture" represents another slide lecture held by Whan Yoo Tae at the IEEE "Ethernet in the first mile task force". This lecture deals with a virtual LLID link.

[0017] Kim Jin held a slide lecture at this IEEE "Ethernet in the first mile task force" which dealt with "Authentication and Privacy in EPON".

[0018] Gummalla Ajay held a slide lecture at this IEEE "Ethernet in the first mile task force" which dealt with the topic "EPON Compliance Architecture".

[0019] It is the object of the present invention to facilitate an improved media access control in an Ethernet passive optical network system.

[0020] This object is solved by the subject matter of the independent claims.

[0021] Preferred embodiments of the present invention are defined by the dependent claims.

[0022] In one aspect of the present invention, a method is provided for implementing logical MAC in an EPON system, and a computer-readable recording medium is provided for recording a program for implementing the method, which inserts LLID (Logical Link ID) information at a predetermined position of a frame outside its preamble and transfer the frame containing the LLID information to a higher layer. Accordingly, general MAC can be used as MAC for the EPON.

[0023] In another aspect of the present invention, the method and recorded medium are each configured to be compatible with an EFM (Ethernet in the First Mile) standard using general MAC.

[0024] In yet another aspect of the present invention, the method and recorded medium each enable logical MAC emulation by transferring LLID (Logical Link ID) information to a higher layer rather than a physical layer.

[0025] The above and other aspects are accomplished by a method for implementing MAC in an Ethernet passive optical network system as specified in claims 1 and 7 corresponding computer product claims 12 and 13.

BRIEF DESCRIPTION OF THE DRAWINGS



[0026] The above and other aspects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which the same or similar elements are annotated with identical reference numerals through the several views:

Fig. 1 is a view illustrating layers based on a layering baseline defined in an IEEE (Institute of Electrical and Electronics Engineers) 802.3ah EFM (Ethernet in the First Mile) standard;

Fig. 2 is a view illustrating an exemplary format of an Ethernet frame based on the IEEE 802.3ah EFM standard;

Fig. 3 is a view illustrating the conventional architecture for transferring a PON tagging Ethernet frame between layers;

Figs. 4A and 4B are views explaining a logical MAC (Media Access Control) implementation method for transferring LLID (Logical Link ID) information to a higher layer in accordance with one embodiment of the present invention;

Fig. 5 is a view explaining the logical MAC implementation method for transferring the LLID information to the higher layer in accordance with another embodiment of the present invention;

Fig. 6 is a flow chart illustrating an upstream frame conversion procedure in a frame conversion method performed by an RS (Reconciliation Sublayer) in accordance with the present invention; and

Fig. 7 is a flow chart illustrating a downstream frame conversion procedure in a frame conversion method performed by the RS in accordance with the present invention


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS



[0027] In the following description, preferred embodiments of the present invention will be described in detail with reference to the annexed drawings, unneeded detailed description of known functions and configurations being omitted for clarity

[0028] Figs. 4A and 4B are views explaining a logical MAC implementation method for transferring LLID (Logical Link ID) information to a higher layer in accordance with one embodiment of the present invention The LLID in the Ethernet frame to be transferred is contained at a predetermined position of the Ethernet frame outside its preamble.

[0029] In detail, the Ethernet frame in accordance with the present invention, differing from the Fig. 2 frame format, includes an 8-byte preamble field 41, a 6-byte DA (Destination Address) field 42, a 6-byte SA (Source Address) field 43, a 2-byte E type field 44 indicating information of an Ether type or "E type" (i.e., mode), a 2-byte LLID (Logical Link ID) field 45, a 2-byte L/T (Length/Type) field 46, a data/PAD (Packet Assembly and Disassembly) field 47 indicating frame data, and an FCS (Frame Check Sequence) field 48 which is arranged at the end of the frame and used for checking an error when information divided on a frame-by-frame basis is sent in data communication

[0030] As shown in Fig. 4B, the E type field 44 can be removed from the Ethernet frame. In other words, the method of the present invention extracts the LLID information from the preamble field 41 and inserts the LLID information at a predetermined position of the Ethernet frame outside the preamble field 41 to transmit the Ethernet frame having the inserted LLID information to an MPCP (Multi-Point Control Protocol) or OAM (Operation, Administration and Maintenance) layer which is a higher layer and a MAC client through the general MAC. The E type does not need to be newly defined.

[0031] As the LLID field 45 is contained in the frame, the LLID information is transferred together when the frame is transferred to the higher layer Consequently, when a PON (Passive Optical Network) system's layers are implemented according to the inventive new frame format, although the single physical MAC layer, the MPCP layer and the OAM layer are used, contents associated with the layers are separated according to the LLID to realize the emulation of a plurality of physical MAC layers

[0032] In the second embodiment of the present invention, described below in connection with Fig 5, the layering differs from that of Fig. 1 in that the data link layer 104 includes the multiplexing layer 316, residing above the OAM layer 120, and in that the MAC layer 114, the MPCP layer 116, the MAC control layer and the OAM layer 120 are all configured to emulate single respective layers. The second embodiment proposes a new logical MAC implementation method designed to overcome possible incompatibility with the existing standard

[0033] Fig. 5 is a view explaining the logical MAC implementation method for transferring the LLID information to the higher layer in accordance with the second embodiment of the present invention. That is, according to the logical MAC implementation method for transferring the LLID information to the higher layer in accordance with the present invention as shown in Fig. 5.

[0034] The potential incompatibility would arise since the physical layer contains the LLID information within the preamble of the Ethernet frame so that the Ethernet frame can be configured as shown in Fig. 2 whereas the MAC layer (contained in the data link layer) or another higher layer contains the LLID information at a predetermined position of the Ethemet frame outside the preamble so that the Ethernet frame can be configured according to the existing standard as shown in Figs. 4A and 4B.

[0035] To bridge this difference, an RS (Reconciliation Sublayer) converts the Ethernet frame according to a frame conversion method as described below by the flow charts in Figs. 6 and 7.

[0036] As shown in Fig. 5, layers according to the standardized and defined layering baseline are classified into a physical layer, a data link layer and an interface layer. The physical layer includes a PMA (Physical Medium Attachment) layer, a PMD (Physical Medium Dependent) layer and a PCS (Physical Coding Sublayer). The data link layer includes a MAC layer, an MPCP layer, a MAC control layer, an OAM layer and a multiplexing layer. The interface layer arranged between the physical layer and the data link layer, includes an RS (Reconciliation Sublayer) being an 802.3 MAC-PLS (Physical Layer Signalling) interface layer and a GMII (Gbps Media Independent Interface) layer.

[0037] In accordance with the embodiment of the present invention, the physical layer consisting of the PMA and PCS layers and the interface layer consisting of the RS and GMII layers have the Ethernet frame containing the LLID information within the preamble as shown in Fig. 2 The data link layer consisting of the MAC layer, the MPCP layer, the MAC control layer, the OAM layer and the multiplexing layer has the LLID information within a predetermined position of the Ethemet frame other than the preamble as shown in Figs. 4A and 4B. Since the LLID information for a lower layer than the MAC Layer exists within the preamble in accordance with the embodiment of the present invention, the present invention is compatible with the 802.3ah EFM standard. On the other hand, as the LLID information for the RS and the MAC client exists within the predetermined position of the frame other than the preamble, the emulation associated with the MAC for the EPON can be easily performed using the existing 802 3 MAC The RS converts the Ethernet frame.

[0038] Fig. 6 is a flow chart illustrating an upstream frame conversion procedure in a frame conversion method performed by the RS in accordance with the present invention. In the reconfiguration process, the RS receives an Ethemet packet from the PCS layer contained in the physical layer and reconfigures the LLID information at step 601.

[0039] Then, the RS determines from the CRC (Cyclical Redundancy Check) field of the preamble whether the preamble of the Ethernet packet has an error at step 602. If an error is determined to exist at the above step 602, the RS discards the received Ethernet packet and reports the error detected through a CRC operation at step 603. On the other hand, if the determination is that no error exists in the preamble, the RS determines from the FCS field of the Ethernet frame of the Ethemet packet whether an error exists in the DA and FCS fields, etc. contained in the Ethernet frame at step 604. If an error exists within the Ethemet frame, the RS reports an FCS error to a higher layer at step 605. On the other hand, if no error exists within the Ethernet frame, the RS configures a new Ethernet frame containing the LLID information at the predetermined position of the frame outside the preamble as shown in Figs. 4A and 4B at step 606. The RS processes an FCS according to the configuration of the MAC layer 114 at step 607.

[0040] In other words, if the FCS associated with the general MAC is disabled, the RS transfers the Ethernet packet to the higher layer (i.e., the MAC layer) without updating the FCS at step 608. Otherwise, if the FCS associated with the general MAC is enabled, the RS newly produces the FCS and inserts the newly produced FCS into the Ethernet packet Then, the RS transfers the Ethernet packet to the higher layer (i.e., the MAC layer) at step 608.

[0041] Fig. 7 is a flow chart illustrating a downstream frame conversion procedure in a frame conversion method performed by the RS in accordance with the present invention The RS reconfigures the LLID information when the downstream transmission is carried out from the MAC layer to the physical layer. At this time, the RS receives an Ethernet packet from the general MAC layer at step 701 The RS extracts the LLID information from an Ethernet frame of the received Ethernet packet at step 702 and then inserts the extracted LLID information within the preamble at step 703 The RS then produces the preamble's CRC information and the Ethernet frame's FCS information, and updates the CRC within the preamble and FCS information within the Ethernet frame at step 704 The RS transfers the updated Ethemet packet to the PCS layer contained in the physical layer at step 705

[0042] In accordance with the present invention, LLID (Logical Link ID) information can be contained at a predetermined position of the frame outside the preamble, and the frame containing the LLID information can be transferred to a higher layer so that general MAC can be used as MAC for an EPON system.

[0043] Further, the present invention is compatible with an EFM (Ethernet in the First Mile) standard using the general MAC.

[0044] Furthermore, the present invention enables logical MAC emulation by transferring the LLID information to a higher layer rather than a physical layer.

[0045] The above-described method of the present invention can be implemented in the form of a computer-readable program, so that it can be stored on a recording medium such as a CD-ROM (Compact Disc-Read Only Memory), a floppy disc, a hard disc, a magnetooptical disc or etc.

[0046] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope of the invention. Therefore, the present invention is not limited to the above-described embodiments, but the present invention is defined by the claims, which follow along with their full scope of equivalents.


Claims

1. A method for implementing Media Access control in an Ethernet passive optical network system, comprising the steps of:

a) causing a physical layer (102) of the Ethernet passive optical network to provide an Ethernet frame comprising a preamble including a Logical Link Identification, LLID, information for identifying a logical link identifier, a Destination Address field (42) for indicating a destination address, an Source Address field (43) for indicating a source address, an Length/Type field (46) for indicating a type and length of the Ethernet frame, a data/Packet Assembly and Disassembly field (47) for indicating data of the Ethernet frame, and an Frame Check Sequence field (48) which is positioned at an end of the Ethernet frame and used for detecting an error of the Ethernet frame when information divided on a frame-by-frame basis is transmitted in data communication, and to transfer the Ethernet frame to a Reconciliation Sublayer (124); and
characterized by

b) causing the Reconciliation Sublayer (124) to reconfigure the Ethernet frame by extracting the LLID information from the preamble and inserting the LLID information at a predetermined position of the Ethernet frame in an LLID field outside said preamble (41) (45), and to transfer the reconfigured Ethernet frame up to a data link layer (104) of the Ethernet passive optical network system.


 
2. The method as set forth in claim 1, wherein the Ethernet frame further comprises an E type field (44) for indicating information of an Ether type.
 
3. The method as set forth in claim 1 or 2, comprising the step of:

c) causing said data link layer (104) to transfer said reconfigured Ethernet frame.


 
4. The method as set forth in claim 1, 2 or 3, wherein the steps b) comprises the steps of

b-1) causing the Reconciliation Sublayer (124) to receive an Ethernet packet from the physical layer (102);

b-2) causing the Reconciliation Sublayer (124) to determine whether an error exists within the preamble (41) of the Ethernet packet received at the step b-1);

b-3) if an error exists within the preamble (419 as a result of the determination at the step b-2), discarding the Ethernet packet and reporting the error of the preamble (41);

b-4) if no error exists within the preamble (41) as the result of the determination at the step b-2), determining whether an error exists within the Ethernet frame of the Ethernet packet;

b-5) if an error exists within the Ethernet frame as a result of the determination at the step b-4), reporting the error of the Ethernet frame;

b-6) if no error exists within the Ethernet frame as the result of the determination at the step b-4), extracting the LLID information contained in the preamble (41) and reconfiguring the Ethernet frame by inserting the LLID information at a predetermined position of the Ethernet frame in an LLID field (45) outside the preamble (41), and

b-7) processing an Frame Check Sequence of the reconfigured Ethernet frame and transferring the reconfigured Ethernet frame.


 
5. The method as set forth in claim 4, wherein, if the Frame Check Sequence is disabled, the step b-7) is carried out by transferring the reconfigured Ethernet frame to a higher layer without updating the Frame Check Sequence.
 
6. The method as set forth in claim 4, wherein, if the Frame Check Sequence is enabled, the step b-7) is carried out by updating the Frame Check Sequence, inserting the updated Frame Check Sequence into the reconfigured Ethernet frame and transferring the reconfigured Ethernet frame to a higher layer.
 
7. A method for implementing Media Access control in an Ethernet passive optical network system, comprising the steps of:

a) causing a data link layer (104) of the Ethernet passive optical network system to transfer an Ethernet frame containing Logical Link Identifier, LLID, information at a predetermined position of the Ethernet frame outside a preamble of the Ethernet frame; and

b) causing an Reconciliation Sublayer (124) to extract (702) the LLID information from the Ethernet frame and reconfigure the Ethernet frame by inserting (703) the LLID information in the preamble (41), and causing the Reconciliation Sublayer (124) to transfer (705) the reconfigured Ethernet frame to a lower physical layer (102) of the Ethernet passive optical network system.


 
8. The method as set forth in claim 7, further comprising the step of:

c) causing the physical layer (102) to transfer the preamble (41) containing the LLID information


 
9. The method as set forth in claim 7 or 8, wherein the Ethernet frame containing LLID information comprises the preamble (41);

a Destination Address field (42) for indicating a destination address;

an Source Address field (43) for indicating a source address,

an Logical Link ID field (45) for indicating the LLID information;

an Length/Type field (46) for indicating the Ethernet frame's length and type;

a data/Packet Assembly and Disassembly field (47) for indicating data of the Ethernet frame; and

an Frame Check Sequence field (48) which is positioned at an end of the Ethernet frame and used for detecting an error of the Ethernet frame when information divided on a frame-by-frame basis is transmitted in data communication,

wherein said Ethernet frame containing Logical Link ID information is transferred to the data link layer (104).
 
10. The method as set forth in claim 9, wherein said Ethernet frame containing LLID information further comprises an E type field (44) for indicating information of an Ether type
 
11. The method as set forth in claim 9 or 10, wherein the step (b) comprises the steps of

b-1) causing the Reconciliation Sublayer (124) to receive (701) the Ethernet frame from the physical layer (102)

b-2) causing the Reconciliation Sublayer (124) to extract (702) the LLID information from the received Ethernet frame and to reconfigure the Ethernet frame by inserting (703) the extracted LLID information within the preamble (41);

b-3) producing an Frame Check Sequence associated with the reconfigured Ethernet frame from which Cyclic Redundancy Check information and the LLID information are removed, and updating (704) the Cyclic Redundancy Check and LLID information within the reconfigured Ethernet frame; and

b-4) transferring (705) the reconfigured Ethernet frame containing the updated Cyclic Redundancy Check and Frame Check Sequence information to the physical layer (102).


 
12. A computer-readable recording medium having recorded thereon a program executable by a processor of an Ethernet passive optical network system, the program comprising:

a) instructions which, when executed by said processor, cause a physical layer (102) of the Ethernet passive optical network system to contain Logical Link Identifier, LLID, information within a preamble and transfer the preamble (41) containing the LLID information, and
characterized in that the program further comprises:

b) instructions which, when executed by said processor, cause an Reconciliation Sublayer (124)) to reconfigure the Ethernet frame by inserting the LLID information at a predetermined position of the Ethernet frame outside the preamble (41) in a LLID field (45), and cause the Reconciliation Sublayer to transfer the reconfigured Ethernet frame to a higher data link layer of the Ethernet passive optical network system; and

c) instructions which, when executed by said processor, cause the data link layer (104) to transfer the reconfigured Ethernet frame containing the LLID information.


 
13. A computer-readable recording medium having recorded thereon a program executable by a processor of an Ethernet passive optical network system, the program comprising:

a) instructions which, when executed by said processor, cause a data link layer (104) of the Ethernet passive optical network system to transfer an Ethernet frame containing Logical Link ID identifier, LLID, information at a predetermined position of the Ethernet frame outside a preamble of the Ethernet frame; and

b) instructions which, when executed by said processor, cause an Reconciliation Sublayer (124)) to extract the LLID information contained in the Ethernet frame and reconfigure the Ethernet frame by containing the LLID information in the preamble (41), and cause the Reconciliation Sublayer (124) to transfer the reconfigured Ethernet frame to a lower physical layer of the Ethernet passive optical network system.


 
14. The computer-readable medium as set forth in claim 13, wherein the program further comprises:

c) instructions which, when executed by said processor, cause the physical layer (102) to transfer the preamble (41) containing the LLID information


 
15. The medium as set forth in claim 12, 13 or 14, wherein the Ethernet frame containing LLID information comprises the preamble (41);

a Destination Address field (42) for indicating a destination address;

an Source Address field (43) for indicating a source address;

an Logical Link ID field (45) for indicating the LLID information;

an Length/Type field (46) for indicating the Ethernet frame's length and type;

a data/Packet Assembly and Disassembly field (47) for indicating data of the Ethernet frame; and

an Frame Check Sequence field (48) which is positioned at an end of the Ethernet frame and used for detecting an error of the Ethernet frame when information divided on a frame-by-frame basis is transmitted in data communication,

wherein said Ethernet frame containing LLID information is transferred to the data link layer
 
16. The medium as set forth in claim 15, wherein said Ethernet frame containing LLID information further comprises an E type field (44) for indicating information of an Ether type.
 


Ansprüche

1. Verfahren zum Implementieren von Medienzugriffssteuerung (Media Access control) in einem EPON-System (Ethernet passive optical network system), das die folgenden Schritte umfasst:

a) Veranlassen, dass eine Bitübertragungsschicht (physical layer) (102) des EPON einen Ethernet-Rahmen bereitstellt, der LLID-Informationen (Logical Link Identification Information) zum Identifizieren eines LLI (logical link identifier), ein Zieladressenfeld (42) zum Anzeigen einer Zieladresse, ein Herkunftsadressenfeld (43) zum Anzeigen einer Herkunftsadresse, ein Längen-/Typ-Feld (46) zum Anzeigen eines Typs und einer Länge des Ethernet-Rahmens, ein Daten-/PAD-Feld (data/Packet Assembly and Disassembly field) (47) zum Anzeigen von Daten des Ethernet-Rahmens und ein Rahmenprüfzeichenfolge-Feld (Frame Check Sequence field) (48) enthält, das an einem Ende des Ethernet-Rahmens positioniert ist und dazu dient, einen Fehler des Ethernet-Rahmens zu erfassen, wenn bei Datenkommunikation in Rahmen unterteilte Informationen gesendet werden, und den Ethernet-Rahmen zu einer Reconciliation-Sublayer (124) zu übertragen; und
dadurch gekennzeichnet, dass

b) die Reconciliation-Sublayer (124) veranlasst wird, den Ethernet-Rahmen umzukonfigurieren, indem sie die LLID-Informationen aus der Präambel extrahiert und die LLID-Informationen an einer vorgegebenen Position des Ethernet-Rahmens in ein LLID-Feld außerhalb der Präambel (41) (45) einfügt und den umkonfigurierten Ethernet-Rahmen aufwärts zu einer Sicherungsschicht (data link layer) (104) des EPON-Systems überträgt.


 
2. Verfahren nach Anspruch 1, wobei der Ethernet-Rahmen des Weiteren ein E-Typ-Feld (44) zum Anzeigen von Informationen eines Ether-Typs umfasst.
 
3. Verfahren nach Anspruch 1 oder 2, das den folgenden Schritt umfasst:

c) Veranlassen, dass die Sicherungsschicht (104) den umkonfigurierten Ethernet-Rahmen überträgt.


 
4. Verfahren nach Anspruch 1, 2 oder 3, wobei der Schritt b) die folgenden Schritte umfasst:

b-1) Veranlassen, dass die Reconciliation-Sublayer (124) ein Ethernet-Paket von der Bitübertragungsschicht (102) empfängt;

b-2) Veranlassen, dass die Reconciliation-Sublayer (124) feststellt, ob ein Fehler innerhalb der Präambel (41) des in dem Schritt b-1) empfangenen Ethernet-Paketes vorhanden ist;

b-3) wenn die Feststellung in dem Schritt b-2) ergibt, dass ein Fehler innerhalb der Präambel (41) vorhanden ist, Verwerfen des Ethernet-Paketes und Berichten des Fehlers der Präambel (41);

b-4) wenn die Feststellung in dem Schritt b-2) ergibt, dass kein Fehler innerhalb der Präambel (41) vorhanden ist, Feststellen, ob ein Fehler innerhalb des Ethernet-Rahmens des Ethernet-Paketes vorhanden ist;

b-5) wenn die Feststellung in dem Schritt b-4) ergibt, dass ein Fehler innerhalb des Ethernet-Rahmens vorhanden ist, Berichten des Fehlers des Ethernet-Rahmens;

b-6) wenn die Feststellung in dem Schritt b-4) ergibt, dass kein Fehler innerhalb des Ethernet-Rahmens vorhanden ist, Extrahieren der in der Präambel (41) enthaltenen LLID-Informationen und Umkonfigurieren des Ethernet-Rahmens durch Einfügen der LLID-Informationen an einer vorgegebenen Position des Ethernet-Rahmens in einem LLID-Feld (45) außerhalb der Präambel (41), und

b-7) Verarbeiten einer Rahmenprüfzeichenfolge des umkonfigurierten Ethernet-Rahmens und Übertragen des umkonfigurierten Ethernet-Rahmens.


 
5. Verfahren nach Anspruch 4, wobei, wenn die Rahmenprüfzeichenfolge deaktiviert ist, der Schritt b-7) ausgeführt wird, indem der umkonfigurierte Ethernet-Rahmen zu einer höheren Schicht übertragen wird, ohne die Rahmenprüfzeichenfolge zu aktualisieren.
 
6. Verfahren nach Anspruch 4, wobei, wenn die Rahmenprüfzeichenfolge aktiviert ist, der Schritt b-7) ausgeführt wird, indem die Rahmenprüfzeichenfolge aktualisiert wird, die aktualisierte Rahmenprüfzeichenfolge in den umkonfigurierten Ethernet-Rahmen eingefügt wird und der umkonfigurierte Ethernet-Rahmen zu einer höheren Schicht übertragen wird.
 
7. Verfahren zum Implementieren von Medienzugriffssteuerung (Media Access control) in einem EPON-System (Ethernet passive optical network system), das die folgenden Schritte umfasst:

a) Veranlassen, dass eine Sicherungsschicht (104) des EPON-Systems einen Ethernet-Rahmen überträgt, der LLID-Informationen (Logical Link Identifier information) an einer vorgegebenen Position des Ethernet-Rahmens außerhalb einer Präambel des Ethernet-Rahmens beinhaltet; und

b) Veranlassen, dass eine Reconciliation-Sublayer (124) die LLID-Informationen aus dem Ethernet-Rahmen extrahiert (702) und den Ethernet-Rahmen umkonfiguriert, indem sie die LLID-Informationen in die Präambel (41) einfügt (703), und Veranlassen, dass die Reconciliation-Sublayer (124) den umkonfigurierten Ethernet-Rahmen zu einer niedrigeren Bitübertragungsschicht (102) des EPON-Systems überträgt (705).


 
8. Verfahren nach Anspruch 7, das des Weiteren den folgenden Schritt umfasst:

c) Veranlassen, dass die Bitübertragungsschicht (102) die Präambel (41) überträgt, die die LLID-Informationen beinhaltet.


 
9. Verfahren nach Anspruch 7 oder 8, wobei der Ethernet-Rahmen, der LLID-Informationen beinhaltet, die Präambel (41) umfasst;

ein Zieladressenfeld (42) zum Anzeigen einer Zieladresse;

ein Herkunftsadressenfeld (43) zum Anzeigen einer Herkunftsadresse,

ein LLID-Feld (Logical Link ID field) (45) zum Anzeigen der LLID-Informationen;

ein Längen-/Typ-Feld (46) zum Anzeigen von Länge und Typ des Ethernet-Rahmens;

ein Daten-/PAD-Feld (data/Packet Assembly and Disassembly field) (47) zum Anzeigen von Daten des Ethernet-Rahmens; und

ein Rahmenprüfzeichenfolge-Feld (Frame Check Sequence field) (48), das an einem Ende des Ethernet-Rahmens positioniert ist und dazu dient, einen Fehler des Ethernet-Rahmens zu erfassen, wenn bei Datenkommunikation in Rahmen unterteilte Informationen gesendet werden,

wobei der Ethernet-Rahmen, der LLID-Informationen beinhaltet, zu der Sicherungsschicht (104) übertragen wird.
 
10. Verfahren nach Anspruch 9, wobei der Ethernet-Rahmen, der LLID-Informationen enthält, des Weiteren ein E-Typ-Feld (44) zum Anzeigen von Informationen eines Ether-Typs umfasst.
 
11. Verfahren nach Anspruch 9 oder 10, wobei der Schritt (b) die folgenden Schritte umfasst:

b-1) Veranlassen, dass die Reconciliation-Sublayer (124) den Ethernet-Rahmen von der Bitübertragungsschicht (102) empfängt (701),

b-2) Veranlassen, dass die Reconciliation-Sublayer (124) die LLID-Informationen aus dem empfangenen Ethernet-Rahmen extrahiert (702) und den Ethernet-Rahmen umkonfiguriert, indem sie die extrahierten LLID-Informationen innerhalb der Präambel (41) einfügt (703);

b-3) Erzeugen einer Rahmenprüfzeichenfolge, die mit dem umkonfigurierten Ethernet-Rahmen verknüpft ist, aus dem CRC-Informationen (Cyclic Redundancy Check information) und die LLID-Informationen entfernt sind, und Aktualisieren (704) der CRC- sowie der LLID-Informationen innerhalb des umkonfigurierten Ethernet-Rahmen; und

b-4) Übertragen (705) des umkonfigurierten Ethernet-Rahmen, der die aktualisierten CRC- und Rahmenprüfzeichenfolge-Informationen beinhaltet, zu der Bitübertragungsschicht (102).


 
12. Computerlesbares Aufzeichnungsmedium, auf dem ein Programm aufgezeichnet ist, das durch eine Verarbeitungseinrichtung eines EPON-Systems (Ethernet passive optical network system) ausgeführt werden kann, wobei das Programm umfasst:

a) Befehle, die, wenn sie durch die Verarbeitungseinrichtung ausgeführt werden, veranlassen, dass eine Bitübertragungsschicht (102) des EPON-Systems LLID-Informationen (Logic Link Identifier information) innerhalb einer Präambel beinhaltet und die Präambel (41) überträgt, die die LLID-Informationen beinhaltet, und
dadurch gekennzeichnet, dass das Programm des Weiteren umfasst:

b) Befehle, die, wenn sie durch die Verarbeitungseinrichtung ausgeführt werden, veranlassen, dass eine Reconciliation-Sublayer (124) den Ethernet-Rahmen umkonfiguriert, indem sie die LLID-Informationen an einer vorgegebenen Position des Ethernet-Rahmens außerhalb der Präambel (41) in einem LLID-Feld (45) einfügt, und veranlassen, dass die Reconciliation-Sublayer den umkonfigurierten Ethernet-Rahmen zu einer höheren Sicherungsschicht des EPON-Systems überträgt; und

c) Befehle, die, wenn sie durch die Verarbeitungseinrichtung ausgeführt werden, veranlassen, dass die Sicherungsschicht (104) den umkonfigurierten Ethernet-Rahmen überträgt, der die LLID-Informationen beinhaltet.


 
13. Computerlesbares Aufzeichnungsmedium, auf dem ein Programm aufgezeichnet ist, das durch eine Verarbeitungseinrichtung eines EPON-Systems (Ethernet passive optical network system) ausgeführt werden kann, wobei das Programm umfasst:

a) Befehle, die, wenn sie durch die Verarbeitungseinrichtung ausgeführt werden, veranlassen, dass eine Sicherungsschicht (104) des EPON-Systems einen Ethernet-Rahmen überträgt, der LLID-Informationen (Logical Link identifier information) an einer vorgegebenen Position des Ethernet-Rahmens außerhalb einer Präambel des Ethernet-Rahmens beinhaltet; und

b) Befehle, die, wenn sie durch die Verarbeitungseinrichtung ausgeführt werden, veranlassen, dass eine Reconciliation-Sublayer (124) die in dem Ethernet-Rahmen beinhalteten LLID-Informationen extrahiert und den Ethernet-Rahmen umkonfiguriert, indem sie die LLID-Informationen in die Präambel (41) einfügt, und veranlassen, dass die Reconciliation-Sublayer (124) den umkonfigurierten Ethernet-Rahmen zu einer niedrigeren Bitübertragungsschicht des EPON-Systems überträgt.


 
14. Computerlesbares Medium nach Anspruch 13, wobei das Programm des Weiteren umfasst:

c) Befehle, die, wenn sie durch die Verarbeitungseinrichtung ausgeführt werden, veranlassen, dass die Bitübertragungsschicht (102) die Präambel (41) überträgt, die die LLID-Informationen beinhaltet.


 
15. Medium nach Anspruch 12, 13 oder 14, wobei der Ethernet-Rahmen, der die LLID-Informationen beinhaltet, die Präambel (41) umfasst;

ein Zieladressenfeld (42) zum Anzeigen einer Zieladresse;

ein Herkunftsadressenfeld (43) zum Anzeigen einer Herkunftsadresse;

ein LLID-Feld (45) zum Anzeigen der LLID-Informationen;

ein Längen-/Typ-Feld (46) zum Anzeigen von Länge und Typ des Ethernet-Rahmens;

ein Daten-/PAD-Feld (47) zum Anzeigen von Daten des Ethernet-Rahmens; und

ein Rahmenprüfzeichenfolge-Feld (48), das an einem Ende des Ethernet-Rahmens positioniert ist und dazu dient, einen Fehler des Ethernet-Rahmens zu erfassen, wenn bei Datenkommunikation in Rahmen unterteilte Informationen gesendet werden,

wobei der Ethernet-Rahmen, der LLID-Informationen beinhaltet, zu der Sicherungsschicht (104) übertragen wird.
 
16. Medium nach Anspruch 15, wobei der Ethernet-Rahmen, der LLID-Informationen beinhaltet, des Weiteren ein E-Typ-Feld (44) zum Anzeigen von Informationen eines Ether-Typs umfasst.
 


Revendications

1. Procédé pour exécuter une commande d'Accès au Support dans un système de réseau optique passif Ethernet, comprenant les étapes qui consistent :

a) à amener une couche physique (102) du réseau optique passif Ethernet à fournir une trame Ethernet comportant un préambule comprenant une information d'Identification de Liaison logique, LLID ("pour Logical Link Identification") pour identifier un identificateur de Liaison Logique, un champ d'Adresse de Destination (42) pour indiquer une adresse de destination, un champ d'Adresse de Source (43) pour indiquer une adresse de source, un champ de Longueur/Type pour indiquer un type et une longueur de la trame Ethernet, un champ d'Assemblage et Désassemblage de données/paquets (47) pour indiquer des données de la trame Ethernet, et un champ de Séquence de Vérification de Trame (48) qui est positionné à une extrémité de la trame Ethernet est utilisé pour détecter une erreur de la trame Ethernet lorsqu'une information divisée sur une base trame par trame est transmise dans une communication de données, et pour transférer la trame Ethernet à une Sous-couche de Réconciliation (124) ; et
caractérisé par

b) le fait d'amener la Sous-couche de Réconciliation (124) à reconfigurer la trame Ethernet en extrayant l'information LLID du préambule et en insérant l'information LLID en une position prédéterminée de la trame Ethernet dans un champ LLID extérieur audit préambule (41) (45), et à transférer la trame Ethernet reconfigurée jusqu'à une couche (104) de liaison de données du système de réseau optique passif Ethernet.


 
2. Procédé selon la revendication 1, dans lequel la trame Ethernet comporte en outre un champ de type E (44) pour indiquer une information d'un type Ether.
 
3. Procédé selon la revendication 1 ou 2, comprenant l'étape de :

c) transfert par ladite couche de liaison de données (104) de ladite trame Ethernet reconfigurée.


 
4. Procédé selon la revendication 1, 2 ou 3, dans lequel l'étape b) comprend les étapes qui consistent

b-1) à amener la Sous-couche de Réconciliation (124) à recevoir un paquet Ethernet provenant de la couche physique (102) ;

b-2) à amener la Sous-couche de Réconciliation (124) à déterminer si une erreur existe dans le préambule (41) du paquet Ethernet reçu à l'étape b-1);

b-3) si une erreur existe dans le préambule (419) en tant que résultat de la détermination à l'étape b-2), à rejeter le paquet Ethernet et à rendre compte de l'erreur du préambule (41) ;

b-4) si aucune erreur n'existe dans le préambule (41) en résultat de la détermination à l'étape b-2), à déterminer si une erreur existe dans la trame Ethernet du paquet Ethernet ;

b-5) si une erreur existe dans la trame Ethernet en résultat de la détermination à l'étape b-4), à rendre compte de l'erreur de la trame Ethernet ;

b-6) si aucune erreur n'existe dans la trame Ethernet en résultat de la détermination à l'étape b-4), à extraire l'information LLID contenue dans le préambule (41) et à reconfigurer la trame Ethernet en insérant l'information LLID dans une position prédéterminée de la trame Ethernet dans un champ LLID (45) extérieur au préambule (41), et

b-7) à traiter une Séquence de Vérification de Trame de la trame Ethernet reconfigurée et à transférer la trame Ethernet reconfigurée.


 
5. Procédé selon la revendication 4, dans lequel, si la Séquence de Vérification de Trame est invalidée, l'étape b-7) est exécutée en transférant la trame Ethernet reconfigurée vers une couche supérieure sans mise à jour de la Séquence de Vérification de Trame.
 
6. Procédé selon la revendication 4, dans lequel, si la Séquence de Vérification de Trame est validée, l'étape b-7) est exécutée en mettant à jour la Séquence de Vérification de Trame, en insérant la Séquence de Vérification de trame mise à jour dans la trame Ethernet reconfigurée et en transférant la trame Ethernet reconfigurée à une couche supérieure.
 
7. Procédé pour exécuter une commande d'Accès au Support dans un système de réseau optique passif Ethernet, comprenant les étapes qui consistent :

a) à amener une couche de liaison de données (104) du système de réseau optique passif Ethernet à transférer une trame Ethernet contenant une information d'identificateur de Liaison Logique, LLID, en une position prédéterminée de la trame Ethernet à l'extérieur d'un préambule de la trame Ethernet ; et

b) à amener une Sous-couche de Réconciliation (124) à extraire (702) l'information LLID de la trame Ethernet et à reconfigurer la trame Ethernet en insérant (703) l'information LLID dans le préambule (41), et à amener la Sous-couche de Réconciliation (124) à transférer (705) la trame Ethernet reconfigurée à une couche physique inférieure (102) du système de réseau optique passif Ethernet.


 
8. Procédé selon la revendication 7, comprenant en outre l'étape qui consiste :

c) à amener la couche physique (102) à transférer le préambule (41) contenant l'information LLID.


 
9. Procédé selon la revendication 7 ou 8, dans lequel la trame Ethernet contenant une information LLID comprend le préambule (41) ;

un champ d'Adresse de Destination (42) pour indiquer une adresse de destination ;

un champ d'Adresse de Source (43) pour indiquer une adresse de source,

un champ d'ID de Liaison Logique (45) pour indiquer l'information LLID ;

un champ de Longueur/Type (46) pour indiquer la longueur et le type de la trame Ethernet ;

un champ d'Assemblage et Désassemblage de données/Paquets (47) pour indiquer des données de la trame Ethernet ; et

un champ de Séquence de Vérification de Trame (48) qui est positionné à une extrémité de la trame Ethernet et est utilisé pour détecter une erreur de la trame Ethernet lorsqu'une information divisée sur une base trame par trame est transmise dans une communication de données,

dans lequel ladite trame Ethernet contenant l'information ID de Liaison Logique est transférée à la couche de liaison de données (104).
 
10. Procédé selon la revendication 9, dans lequel ladite trame Ethernet contenant l'information LLID comprend en outre un champ de type E (44) pour indiquer une information d'un type Ether.
 
11. Procédé selon la revendication 9 ou 10, dans lequel l'étape b) comprend les étapes qui consistent

b-1) à amener la Sous-couche de Réconciliation (124) à recevoir (701) la trame Ethernet depuis la couche physique (102),

b-2) à amener la Sous-couche de Réconciliation (124) à extraire (702) l'information LLID de la trame Ethernet reçue et à reconfigurer la trame Ethernet en insérant (703) l'information LLID extraite dans le préambule (41) ;

b-3) à produire une Séquence de Vérification de Trame associée à la trame Ethernet reconfigurée de laquelle une information de Vérification de Redondance Cyclique et l'information LLID sont supprimées, et à mettre à jour (704) la Vérification de Redondance Cyclique et l'information LLID dans la trame Ethernet reconfigurée ; et

b-4) à transférer (705) la trame Ethernet reconfigurée contenant la Vérification de Redondance Cyclique et l'information de Séquence de Vérification de Trame mises à jour à la couche physique (102).


 
12. Support d'enregistrement lisible par ordinateur sur lequel est enregistré un programme pouvant être exécuté par un processeur d'un système de réseau optique passif Ethernet, le programme comprenant :

a) des instructions qui, lorsqu'elles sont exécutées par ledit processeur, amènent une couche physique (102) du système de réseau optique passif Ethernet à contenir une information d'identificateur de Liaison Logique, LLID, dans un préambule et à transférer le préambule (41) contenant l'information LLID, et
caractérisé en ce que le programme comporte en outre :

b) des instructions qui, lorsqu'elles sont exécutées par ledit processeur, amènent une Sous-couche de Réconciliation (124) à reconfigurer la trame Ethernet en insérant l'information LLID en une position prédéterminée de la trame Ethernet à l'extérieur du préambule (41) dans un champ LLID (45), et amènent la Sous-couche de Réconciliation à transférer la trame Ethernet reconfigurée à une couche de liaison de données supérieure du système de réseau optique passif Ethernet ; et

c) des instructions qui, lorsqu'elles sont exécutées par ledit processeur, amènent la couche de liaison de données (104) à transférer la trame Ethernet reconfigurée contenant l'information LLID.


 
13. Support d'enregistrement lisible par ordinateur sur lequel est enregistré un programme exécutable par un processeur d'un système de réseau optique passif Ethernet, le programme comprenant :

a) des instructions qui, lorsqu'elles sont exécutées par ledit processeur, amènent une couche de liaison de données (104) du système de réseau optique passif Ethernet à transférer une trame Ethernet contenant une information d'identificateur ID de Liaison Logique, LLID, en une position prédéterminée de la trame Ethernet à l'extérieur d'un préambule de la trame Ethernet ; et

b) des instructions qui, lorsqu'elles sont exécutées par ledit processeur, amènent une Sous-couche de Réconciliation (124) à extraire l'information LLID contenue dans la trame Ethernet et à reconfigurer la trame Ethernet en amenant l'information LLID à être contenue dans le préambule (41), et amènent la Sous-couche de Réconciliation (124) à transférer la trame Ethernet reconfigurée à une couche physique inférieure du système de réseau optique passif Ethernet.


 
14. Support lisible par ordinateur selon la revendication 13, dans lequel le programme comprend en outre :

c) des instructions qui, lorsqu'elles sont exécutées par ledit processeur, amènent la couche physique (102) à transférer le préambule (41) contenant l'information LLID.


 
15. Support selon la revendication 12, 13 ou 14, dans lequel la trame Ethernet contenant l'information LLID comprend le préambule (41) ;

un champ d'Adresse de Destination (42) pour indiquer une adresse de destination ;

un champ d'Adresse de Source (43) pour indiquer une adresse de source ;

un champ d'ID de Liaison Logique (45) pour indiquer l'information LLID ;

un champ de Longueur/Type (46) pour indiquer la longueur et le type de la trame Ethernet ;

un champ d'Assemblage et Désassemblage de données/Paquets pour indiquer des données de la trame Ethernet ; et

un champ de Séquence de Vérification de Trame (48) qui est positionné à une extrémité de la trame Ethernet et est utilisé pour détecter une erreur de la trame Ethernet lorsqu'une information divisée sur une base trame par trame est transmise dans une communication de données,

dans lequel ladite trame Ethernet contenant l'information LLID est transférée à la couche de liaison de données (104).
 
16. Support selon la revendication 15, dans lequel ladite trame Ethernet contenant l'information LLID comprend en outre un champ de type E (44) pour indiquer une information d'un type Ether.
 




Drawing




















Cited references

REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description